Red reacts with anger to Andy's dreams of Zihuatanejo because he loves Andy deeply and fears that harboring impossible hopes will ultimately destroy his friend's sanity. In the brutal world of Shawshank, survival requires accepting the reality of confinement. Red has spent decades watching men break themselves against the walls of the prison by clinging to illusions of the outside world. When Andy paints a vivid picture of a warm, blue Pacific ocean and a quiet life fixing up an old boat, Red recognizes it as a beautiful but dangerous fantasy. He snaps because he knows that the contrast between that warm paradise and the cold reality of their concrete cell is too painful to bear. Red's outburst is not born of malice, but of a protective instinct; he is trying to shield Andy from the devastating psychological crash that occurs when hope is finally crushed by the system. By trying to force Andy to face reality, Red is desperately trying to keep his best friend alive and functional within the only world they have left.